| All Patents in class 33/381 |
Patents 1 -
15
of 36
      |
| Number | Date | Patentee | Title | Type |
| 20,943 | Jul. 20, 1858 | W.O. Fritschler | Carpenter's Rule | folding rules |
| 28,104 | May 01, 1860 | W.T. Nicholson | Spirit Level | metallic levels |
| 320,537 | Jun. 23, 1885 | B.B. Butt | Spirit Level | metallic levels |
| 354,076 | Dec. 07, 1886 | E.E. Webb | Spirit Level | metallic levels |
| 423,484 | Mar. 18, 1890 | W. Martin | Inclinometer | inclinometers |
| 423,669 | Mar. 18, 1890 | J.A. Byrne | Spirit Level | levels |
| 436,495 | Sep. 16, 1890 | P.L. Fox | Spirit Level | levels |
| 453,452 | Jun. 02, 1891 | J.A. Traut | Hand-y Groove | wooden levels |
| 469,451 | Feb. 23, 1892 | W. Praddex | Spirit Level | |
| 498,726 | May 30, 1893 | C.W. Preston | Stock for Surface Gages or Other Implements | surface gauges |
| 544,587 | Aug. 13, 1895 | W. Moore | Plumb and Level | levels |
| 555,771 | Mar. 03, 1896 | E. Hohnbaum | Level | inclinometers |
| 582,517 | May 11, 1897 | S.H. Bellows | Shaft Level | machinist levels |
| 642,888 | Feb. 06, 1900 | A. Van Vliet | Combination Tool | carpenter squares |
| 706,095 | Aug. 05, 1902 | E. Oehrle | Combination Square and Protractor | squares |
